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September Weather in Clayton, United States

Last updated: June 24, 2025

In September, the average temperature in Clayton, United States reaches a warm 27°C (80°F), with a minimum dipping to 11°C (52°F) and a maximum soaring to 40°C (104°F). Expect a total precipitation of 99 mm (3.9 in) over approximately 9 days, coupled with an average humidity level of 79%.

September Temperature in Clayton

In September in Clayton, the average temperature is 27°C (80°F). Maximums can reach 40°C (104°F), and minimums can be as low as 11°C (52°F). This diverse temperature range makes it essential for travelers to pack accordingly, ensuring comfort for both warm days and cool evenings.

September Weather in Clayton: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Clayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Clayton, September typically has an average temperature of 27°C (80°F), with highs reaching up to 40°C (104°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec505563667580838280705754
Data source: Temperature data for Clayton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Clayton

In Clayton in September, the precipitation amount is 99 mm (3.9 in) during a span of 9 days.

September Precipitation Trends in Clayton

The chart displays monthly precipitation patterns in Clayton, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Clayton, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1191461131441361321151139911782121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clayton

In Clayton in September humidity is 79%. With an average temperature of 27°C (80°F), this humidity feels like walking through a warm, dense blanket, making travel feel sluggish and allowing every step to become noticeably heavier.

September Average Humidity in Clayton

This chart illustrates the average monthly humidity levels in Clayton, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Clayton is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clayton

In Clayton in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Clayton.

Maximum UV Index Levels in Clayton for September

The chart shows the monthly maximum UV Index (UVI) for Clayton in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Clayton typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111112121110864
Data source: Clayton September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Clayton Compares to Other Months

Weather in Clayton varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Clayton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Clayton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)119 mm (4.7 inches)83%moderate
February Weather13°C (55°F)146 mm (5.8 inches)83%high
March Weather17°C (63°F)113 mm (4.5 inches)80%very high
April Weather19°C (66°F)144 mm (5.7 inches)81%extreme
May Weather24°C (75°F)136 mm (5.3 inches)81%extreme
June Weather27°C (80°F)132 mm (5.2 inches)78%extreme
July Weather28°C (83°F)115 mm (4.5 inches)79%extreme
August Weather28°C (83°F)113 mm (4.4 inches)79%extreme
September Weather27°C (80°F)99 mm (3.9 inches)79%very high
October Weather21°C (71°F)117 mm (4.6 inches)77%very high
November Weather14°C (57°F)82 mm (3.2 inches)85%high
December Weather12°C (54°F)120 mm (4.7 inches)88%moderate

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